Squeeze roller elevating apparatus of a liquid developing appara

Details Squeeze roller elevating apparatus of a liquid developing appara Squeeze roller elevating apparatus of a liquid developing appara

1999-06-21

2000-10-03

Lee, Susan S. Y.

Electrophotography

Image formation

Development

399237, G03G 1510

Patent

active

061284572

ABSTRACT:
In an apparatus for elevating a squeeze roller of a liquid developing apparatus, a sub-block having the squeeze roller selectively pressing a photoreceptor web installed thereon, is installed at a main block of the liquid developing apparatus to be capable of moving up and down. A mobile block is installed at the main block to be capable of moving up and down to support the sub-block. The mobile block is moved up and down by an elevating unit to allow the squeeze roller to contact or be separated from the photoreceptor web. A piezoelectric element is installed at the mobile block to support the sub-block and to move the sub-block up and down in a predetermined range by being reversibly transformed by electric current. A power supply selectively provides electric current to the piezoelectric element. Thus, the decline over time of the elastic force of the spring employed in the conventional elevating apparatus can be fundamentally solved. Further, when the liquid developing apparatus of the present invention is used for a long time, the pressing force of the squeeze roller to the photoreceptor web can be uniformly maintained.

REFERENCES:
patent: 5915153 (1999-06-01), Kim et al.
patent: 5987285 (1999-11-01), Kusayanagi
patent: 6049684 (2000-04-01), Nishikawa et al.

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